Lin et al. (2026) Hydroclimatic Regime Shift Weakens Snowmelt Regulation of Summer Heat Extremes in Northern China

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-08-21
• Authors: Jing Lin, Baolin Xue, Junping Wang, Xianhong Xie, Guoqiang Wang, Limin Duan
• DOI: 10.1002/joc.70561

Research Groups

• Institute of Atmospheric Physics, Chinese Academy of Sciences
• Department of Earth System Science, University of California, Irvine
• Key Laboratory of Regional Climate-Environment Research, China Meteorological Administration

Short Summary

This study investigates the impact of hydroclimatic changes on summer heat extremes in northern China, revealing a weakened regulation of land-surface moisture buffering by cumulative spring snowmelt.

Objective

• Investigate how changes in precipitation phase and seasonal water supply affect summer heat extremes in midlatitude dryland transition zones.

Study Configuration

• Spatial Scale: Northern China, including northwestern, northeastern, and North China regions.
• Temporal Scale: Daily observations from 1980 to 2019.

Methodology and Data

• Models used: Not specified (observational study).
• Data sources: Daily meteorological station data from 348 stations across northern China.

Main Results

• Cumulative spring snowmelt has a regulatory association with summer heat extremes, particularly for maximum temperature.
• Pathway analysis suggests that antecedent upper-root-zone soil moisture and surface energy partitioning mediate the snowmelt–heat linkage.
• After 2000, mean effective cumulative spring snowmelt decreased, leading to increased sensible heat flux and summer heat metrics.

Contributions

• This study provides new insights into how hydroclimatic changes in northern China have altered land-surface regulation of summer heat extremes.
• The findings highlight the importance of considering climate warming impacts on regional water–heat interactions and heat risk amplification.

Funding

• National Natural Science Foundation of China (Grant No. 91737206)
• National Key Research and Development Program of China (Grant No. 2016YFA0602400)

Citation

@article{Lin2026Hydroclimatic,
  author = {Lin, Jing and Xue, Baolin and Wang, Junping and Xie, Xianhong and Wang, Guoqiang and Duan, Limin},
  title = {Hydroclimatic Regime Shift Weakens Snowmelt Regulation of Summer Heat Extremes in Northern China},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70561},
  url = {https://doi.org/10.1002/joc.70561}
}